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<div class="title">/data/users/hoss/faiss/ThreadedIndex.h</div>  </div>
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<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) Facebook, Inc. and its affiliates.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * This source code is licensed under the MIT license found in the</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;</div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#include &quot;Index.h&quot;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &quot;IndexBinary.h&quot;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &quot;WorkerThread.h&quot;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;memory&gt;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="keyword">namespace </span>faiss {</div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment">/// A holder of indices in a collection of threads</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment">/// The interface to this class itself is not thread safe</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"></span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> IndexT&gt;</div>
<div class="line"><a name="l00021"></a><span class="lineno"><a class="line" href="classfaiss_1_1ThreadedIndex.html">   21</a></span>&#160;<span class="keyword">class </span><a class="code" href="classfaiss_1_1ThreadedIndex.html">ThreadedIndex</a> : <span class="keyword">public</span> IndexT {</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;  <span class="keyword">explicit</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html">ThreadedIndex</a>(<span class="keywordtype">bool</span> threaded);</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;  <span class="keyword">explicit</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html">ThreadedIndex</a>(<span class="keywordtype">int</span> d, <span class="keywordtype">bool</span> threaded);</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;  ~<a class="code" href="classfaiss_1_1ThreadedIndex.html">ThreadedIndex</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">  /// override an index that is managed by ourselves.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">  /// WARNING: once an index is added, it becomes unsafe to touch it from any</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">  /// other thread than that on which is managing it, until we are shut</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">  /// down. Use runOnIndex to perform work on it instead.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment"></span>  <span class="keywordtype">void</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#a9a11a672369d48f45cf1dd1bfe0dad87">addIndex</a>(IndexT* index);</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment">  /// Remove an index that is managed by ourselves.</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">  /// This will flush all pending work on that index, and then shut</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment">  /// down its managing thread, and will remove the index.</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment"></span>  <span class="keywordtype">void</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#a21604d6b8b8d42e6cc78c26e85564027">removeIndex</a>(IndexT* index);</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">  /// Run a function on all indices, in the thread that the index is</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">  /// managed in.</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">  /// Function arguments are (index in collection, index pointer)</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment"></span>  <span class="keywordtype">void</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#a30ade89dc4e571868cf121e5592d6687">runOnIndex</a>(std::function&lt;<span class="keywordtype">void</span>(<span class="keywordtype">int</span>, IndexT*)&gt; f);</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;  <span class="keywordtype">void</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#a30ade89dc4e571868cf121e5592d6687">runOnIndex</a>(std::function&lt;<span class="keywordtype">void</span>(<span class="keywordtype">int</span>, <span class="keyword">const</span> IndexT*)&gt; f) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">  /// faiss::Index API</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">  /// All indices receive the same call</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment"></span>  <span class="keywordtype">void</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#a4536f6e7a8cce1f79bebc420ae1e909b">reset</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">  /// Returns the number of sub-indices</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"><a class="line" href="classfaiss_1_1ThreadedIndex.html#a25aac2b3024e7f900687f85f625afaba">   50</a></span>&#160;<span class="comment"></span>  <span class="keywordtype">int</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#a25aac2b3024e7f900687f85f625afaba">count</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#acb0dc6a321ad80636d5fef5cc7edd05b">indices_</a>.size(); }</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">  /// Returns the i-th sub-index</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="classfaiss_1_1ThreadedIndex.html#a9d150a2d26d97b703af2a78e0c564c0e">   53</a></span>&#160;<span class="comment"></span>  IndexT* <a class="code" href="classfaiss_1_1ThreadedIndex.html#a9d150a2d26d97b703af2a78e0c564c0e">at</a>(<span class="keywordtype">int</span> i) { <span class="keywordflow">return</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#acb0dc6a321ad80636d5fef5cc7edd05b">indices_</a>[i].first; }</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment">  /// Returns the i-th sub-index (const version)</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="classfaiss_1_1ThreadedIndex.html#ae84b4b14209700f372b9a82b78123f1a">   56</a></span>&#160;<span class="comment"></span>  <span class="keyword">const</span> IndexT* <a class="code" href="classfaiss_1_1ThreadedIndex.html#ae84b4b14209700f372b9a82b78123f1a">at</a>(<span class="keywordtype">int</span> i)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#acb0dc6a321ad80636d5fef5cc7edd05b">indices_</a>[i].first; }</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment">  /// Whether or not we are responsible for deleting our contained indices</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="classfaiss_1_1ThreadedIndex.html#a33201cb008802a729f61c76d519cb58a">   59</a></span>&#160;<span class="comment"></span>  <span class="keywordtype">bool</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#a33201cb008802a729f61c76d519cb58a">own_fields</a>;</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160; <span class="keyword">protected</span>:<span class="comment"></span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">  /// Called just after an index is added</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment"></span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#abdcae15f8589c53d4fa648fb2d5ab625">onAfterAddIndex</a>(IndexT* index);</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">  /// Called just after an index is removed</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment"></span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#a3bfc1a3002a150d850b20dc40c5d31fe">onAfterRemoveIndex</a>(IndexT* index);</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="keyword">protected</span>:</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;  <span class="keyword">static</span> <span class="keywordtype">void</span> waitAndHandleFutures(std::vector&lt;std::future&lt;bool&gt;&gt;&amp; v);</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment">  /// Collection of Index instances, with their managing worker thread if any</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="classfaiss_1_1ThreadedIndex.html#acb0dc6a321ad80636d5fef5cc7edd05b">   72</a></span>&#160;<span class="comment"></span>  std::vector&lt;std::pair&lt;IndexT*, std::unique_ptr&lt;WorkerThread&gt;&gt;&gt; <a class="code" href="classfaiss_1_1ThreadedIndex.html#acb0dc6a321ad80636d5fef5cc7edd05b">indices_</a>;</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment">  /// Is this index multi-threaded?</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"><a class="line" href="classfaiss_1_1ThreadedIndex.html#a1031b2c900e9ba53573e617539b3c488">   75</a></span>&#160;<span class="comment"></span>  <span class="keywordtype">bool</span> <a class="code" href="classfaiss_1_1ThreadedIndex.html#a1031b2c900e9ba53573e617539b3c488">isThreaded_</a>;</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;};</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;} <span class="comment">// namespace</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="preprocessor">#include &quot;ThreadedIndex-inl.h&quot;</span></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_a21604d6b8b8d42e6cc78c26e85564027"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#a21604d6b8b8d42e6cc78c26e85564027">faiss::ThreadedIndex::removeIndex</a></div><div class="ttdeci">void removeIndex(IndexT *index)</div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex-inl_8h_source.html#l00088">ThreadedIndex-inl.h:88</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_a1031b2c900e9ba53573e617539b3c488"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#a1031b2c900e9ba53573e617539b3c488">faiss::ThreadedIndex::isThreaded_</a></div><div class="ttdeci">bool isThreaded_</div><div class="ttdoc">Is this index multi-threaded? </div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex_8h_source.html#l00075">ThreadedIndex.h:75</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_ae84b4b14209700f372b9a82b78123f1a"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#ae84b4b14209700f372b9a82b78123f1a">faiss::ThreadedIndex::at</a></div><div class="ttdeci">const IndexT * at(int i) const </div><div class="ttdoc">Returns the i-th sub-index (const version) </div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex_8h_source.html#l00056">ThreadedIndex.h:56</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html">faiss::ThreadedIndex</a></div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex_8h_source.html#l00021">ThreadedIndex.h:21</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_a33201cb008802a729f61c76d519cb58a"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#a33201cb008802a729f61c76d519cb58a">faiss::ThreadedIndex::own_fields</a></div><div class="ttdeci">bool own_fields</div><div class="ttdoc">Whether or not we are responsible for deleting our contained indices. </div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex_8h_source.html#l00059">ThreadedIndex.h:59</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_a9a11a672369d48f45cf1dd1bfe0dad87"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#a9a11a672369d48f45cf1dd1bfe0dad87">faiss::ThreadedIndex::addIndex</a></div><div class="ttdeci">void addIndex(IndexT *index)</div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex-inl_8h_source.html#l00049">ThreadedIndex-inl.h:49</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_acb0dc6a321ad80636d5fef5cc7edd05b"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#acb0dc6a321ad80636d5fef5cc7edd05b">faiss::ThreadedIndex::indices_</a></div><div class="ttdeci">std::vector&lt; std::pair&lt; IndexT *, std::unique_ptr&lt; WorkerThread &gt; &gt; &gt; indices_</div><div class="ttdoc">Collection of Index instances, with their managing worker thread if any. </div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex_8h_source.html#l00072">ThreadedIndex.h:72</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_a25aac2b3024e7f900687f85f625afaba"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#a25aac2b3024e7f900687f85f625afaba">faiss::ThreadedIndex::count</a></div><div class="ttdeci">int count() const </div><div class="ttdoc">Returns the number of sub-indices. </div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex_8h_source.html#l00050">ThreadedIndex.h:50</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_a30ade89dc4e571868cf121e5592d6687"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#a30ade89dc4e571868cf121e5592d6687">faiss::ThreadedIndex::runOnIndex</a></div><div class="ttdeci">void runOnIndex(std::function&lt; void(int, IndexT *)&gt; f)</div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex-inl_8h_source.html#l00119">ThreadedIndex-inl.h:119</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_a3bfc1a3002a150d850b20dc40c5d31fe"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#a3bfc1a3002a150d850b20dc40c5d31fe">faiss::ThreadedIndex::onAfterRemoveIndex</a></div><div class="ttdeci">virtual void onAfterRemoveIndex(IndexT *index)</div><div class="ttdoc">Called just after an index is removed. </div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex-inl_8h_source.html#l00169">ThreadedIndex-inl.h:169</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_a9d150a2d26d97b703af2a78e0c564c0e"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#a9d150a2d26d97b703af2a78e0c564c0e">faiss::ThreadedIndex::at</a></div><div class="ttdeci">IndexT * at(int i)</div><div class="ttdoc">Returns the i-th sub-index. </div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex_8h_source.html#l00053">ThreadedIndex.h:53</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_abdcae15f8589c53d4fa648fb2d5ab625"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#abdcae15f8589c53d4fa648fb2d5ab625">faiss::ThreadedIndex::onAfterAddIndex</a></div><div class="ttdeci">virtual void onAfterAddIndex(IndexT *index)</div><div class="ttdoc">Called just after an index is added. </div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex-inl_8h_source.html#l00164">ThreadedIndex-inl.h:164</a></div></div>
<div class="ttc" id="classfaiss_1_1ThreadedIndex_html_a4536f6e7a8cce1f79bebc420ae1e909b"><div class="ttname"><a href="classfaiss_1_1ThreadedIndex.html#a4536f6e7a8cce1f79bebc420ae1e909b">faiss::ThreadedIndex::reset</a></div><div class="ttdeci">void reset() override</div><div class="ttdef"><b>Definition:</b> <a href="ThreadedIndex-inl_8h_source.html#l00156">ThreadedIndex-inl.h:156</a></div></div>
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